1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Initial velocity

  1. Sep 24, 2004 #1
    A ball has an initial velocity of 10 m/s.
    The acceleration of gravity is 9.8 m/s^2.

    What will be it's postion after 2.12794 s if it is throw

    a) down with an initial velocity of 10 m/s? Answer in units of m.

    b) up with an initial velocity of 10 m/s? Answer in units of m.

    --

    I think for b you use:

    y = Vot + 1/2gt^2

    I got 43.47m, but thats wrong.
     
  2. jcsd
  3. Sep 24, 2004 #2

    Pyrrhus

    User Avatar
    Homework Helper

    I got -1.03, i think your calculations are wrong, and also i forgot if its negative it's pointing down, so it's going down.
     
    Last edited: Sep 24, 2004
  4. Sep 24, 2004 #3
    use this : y = 10t - 9.8t²/2 and the t is given

    the g-vector points downwards the y axis thus you need to write a minus sign. Watch out when you work with vectors : you have the magnitude of a vector AND the direction of a vector...

    marlon
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Initial velocity
  1. Initial Velocity (Replies: 3)

  2. Initial Velocity (Replies: 1)

  3. Initial Velocity (Replies: 2)

  4. Initial velocity (Replies: 1)

Loading...